will. Space-time concomitant mainly refers to my phone number and the diagnosis of the number in the same space-time grid to do a range of **** the same stay for more than 10 minutes, and the last 14 days either side of the number of the cumulative length of stay of more than 30 hours or more, found out the number for space-time concomitant number. For this kind of people, the community is able to use the big data network to rank and calculate, so during the epidemic period of personal circumstances have any abnormalities, need to be timely to the community, the street, etc. reported.